tiles


Note:  Do not rely on this information. It is very old.

Dioptrics

Dioptrics, that part of optics which treats of light refracted by its passage from one medium to another in which the speed of propagation is different. Catoptrics is the old term for the part of optics relating to reflection of light. Hence the expressions dioptric and catoptric that were given by older philosophers to refracting and reflecting telescopes respectively. The terms are becoming obsolete.